This receiver
plugin will allow you to toggle the scannable state of the bookmarks with right mouse button.
The scanner (enabled by right-clicking the SQ button on the left of the SQL slider) will scan only the enabled bookmarks.
Add this line in your init.js
file:
Plugins.load('https://0xaf.github.io/openwebrxplus-plugins/receiver/toggle_scannable/toggle_scannable.js');
Learn how to load plugins.